In light of the current pandemic, ECRIN is organising a virtual event for International Clinical Trials Day (ICTD) on May 20th, 2021. ICTD 2021 will bring together stakeholders from across Europe and the globe to discuss the growing interest in platform trials from best practices to challenges in the European context. ICTD is open to research organisations, clinical research professionals, patient organisations, regulatory and ethics bodies, funders and industry. Platform trials, sometimes known as adaptive platform trials, allow a multitude of different treatment options (arms) to be compared with a single control (arm). They enable ineffective arms to be stopped after an interim analysis. To date, they have been used principally in the field of oncology and more recently infectious diseases. They represent the clinical approach selected by the European Commission to find a treatment for COVID-19. This new trial format raises many questions, changes our approach to conducting clinical trials and testing for appropriate treatments.